Andy Little / Mbed OS mag_test3

First draft HMC5883 magnetometer sensor using physical quantities, outputting via serial port using std::cout on mbed os 5

Diff: mbed-os.lib

Revision:
0:37dbfb036586
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Sat Mar 21 23:18:28 2020 +0000
@@ -0,0 +1,1 @@
+https://github.com/armmbed/mbed-os/#532654ebb31c7bf79601042a6fa976b85532ef47